1994 LS400 Catalytic converter REPLACEMENT.......O2 sensor question - ClubLexus - Lexus Forum Discussion


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1994 LS400 Catalytic converter REPLACEMENT.......O2 sensor question

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Old 11-15-17, 01:04 AM   #1
OMAHA
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Default 1994 LS400 Catalytic converter REPLACEMENT.......O2 sensor question

Which sensors should i get to do this? Denso of course but what specific sensors do i need? Any thing else do i need?
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Old 11-15-17, 03:37 PM   #2
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There are 4 O2 sensors, 2 upstream (before cat) & 2 downstream (after cat) sensors on each bank. Why are you changing them? You'll need to give us more info so we can help you.
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Old 11-15-17, 05:09 PM   #3
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Pretty sure he just wants part number. Anyone know ow if they are the same as on a 90? Pretty sure the are different.
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Old 11-15-17, 05:44 PM   #4
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There are 4 O2 sensors, 2 upstream (before cat) & 2 downstream (after cat) sensors on each bank. Why are you changing them? You'll need to give us more info so we can help you.
i believe i melted a cat.... or its clogged, or both....lol... so i figured i may as well replace both cats and O2s....
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Old 11-15-17, 05:47 PM   #5
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I see some densos on rock auto and was wondering which ones to get.....Lexus quoted me $4200 just for parts
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Old 11-15-17, 06:25 PM   #6
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Geez I built a whole new exhaust including cats and o2 sensors for 400 bucks.
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Old 11-15-17, 09:59 PM   #7
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Stay away from the stealer & go w/ Rockauto. I've purchased tons of parts from this online store for years. They have very good price & good selection of parts based on how much you want to spend. In regards to the O2 sensors & cats, you can't go wrong w/ Denso as it's OEM & you can go w/ aftermarket cats i.e. Walker, Magnaflow, etc... but make sure it's legal in your state.
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Old 11-16-17, 10:29 AM   #8
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So i need a total of 4 upstream and 4 downstream sensors for 2 catalytic converters..... this costs more than i initially thought!!
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Old 11-16-17, 05:36 PM   #9
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No man you only need 2 of each.
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Old 11-16-17, 11:16 PM   #10
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No man you only need 2 of each.
Thanks for the input....i believed that i needed to order 2 upstream and 2 downstream O2sensors for each cat. That's how i came up with 8 total....lol
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Old 11-17-17, 08:47 PM   #11
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So i need a total of 4 upstream and 4 downstream sensors for 2 catalytic converters..... this costs more than i initially thought!!
Total of four for the vehicle.
Two upstream (one left and one right) and two downstream (one left and one right). Math quiz on Monday.
Colin
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Old 11-19-17, 10:49 AM   #12
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Thanks for the input people....i ordered EASTERN catalytic converters ($1432) and DENSO upstream O2 sensors ($542) and DENSO downstream O2 sensors ($602)..... So far so good!
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Old 11-19-17, 10:58 AM   #13
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Now call a few local muffler shops for price. It should be around $100 to get them install assuming the exhaust pipes & mufflers are still in good shape. For the new O2 sensors, make sure you screw them in first then hook up the connectors, otherwise the wires will twist on you. Good luck.
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Old 11-19-17, 05:39 PM   #14
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For other's buying O2 sensors, check Amazon too. I just bought some Denso bank 1 sensors for $45/each. They had a prior sale I missed out on and that price was $39.98
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Old 11-20-17, 10:52 AM   #15
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For other's buying O2 sensors, check Amazon too. I just bought some Denso bank 1 sensors for $45/each. They had a prior sale I missed out on and that price was $39.98
good info!!
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